Micrina

Micrina is an extinct genus of tommotiids with affinities to brachiopods.

Micrina can be considered a stem group brachiopod based on its larval shell

Its microstructure is very brachiopod like and its adult morphology is similarly bivalved, even though it was once thought to be halkieriid-like.

Micrina is quite similar to Mickwitzia in terms of shell microstructure. The two genera are evidently closely related.

Species

 * M. etheridgei (Tate, 1892)
 * M. pusilla Gravestock et al., 2001
 * M. ridicula (Barskova, 1988)
 * M. xiaotanensis Li & Xiao, 2004